he Obama administration proposed new rules Friday that would effectively require passenger cars to be equipped with video cameras and in-vehicle displays to eliminate driver blind spots behind the vehicle.

The rule would be phased in starting in 2012 and would apply to all cars manufactured after Sept. 1, 2004.

Rearview video is the most expensive single technology in vehicles, regulators said, and they estimated that equipping all new cars in a given year could cost between $1.9 billion and $2.7 billion.